CHANNEL-TO-CHANNEL PRESSURE DIFFERENCES IN SERPENTINE MINICHANNEL FLOW SYSTEMS
CHANNEL-TO-CHANNEL PRESSURE DIFFERENCES IN SERPENTINE MINICHANNEL FLOW SYSTEMS
复制标题
DOI：
10.1080/10893950590913233
复制
发表时间：
2005-02
期刊：
影响因子：
--
通讯作者：
P. Oosthuizen;M. Austin
中科院分区：
文献类型：
--
作者：
P. Oosthuizen;M. Austin
可能导致 PEM 燃料电池流板故障的相互关联因素之一是相邻流道之间存在的压力差。这些压力差会导致通道支撑件（即肋）中产生应力，这在由于其他因素（例如流板中的温度梯度）而产生应力的情况下可能很重要。为了研究跨支撑件的压差大小以及最大压差发生的位置，对各种形式的蛇形通道（这些通道具有矩形横截面形状）中的流量和压力变化进行了数值计算。忽略了扩散层的存在，并使用商业有限元软件包使用以无量纲形式编写的控制方程来计算流量。对于两种通道高宽比（一和三）所考虑的每种流动几何形状，已经获得了各种雷诺数值的解决方案。正如预期的那样，除了通道中弯曲附近的流动之外，压力在通道横截面上没有显着变化。已确定给定通道中的中心点无因次压力与相邻通道中相同纵向位置处的中心点无因次压力之间的差异。已经检查了通道之间最高无量纲压力差对输入参数的依赖性。 273点
One of the interconnected factors that can lead to failures in the flow plates of PEM fuel cells is the pressure differences that exist between adjacent flow channels. These pressure differences lead to stresses in the channel supports—i.e., the ribs—which can be important in the presence of stresses arising due to other factors such as temperature gradients in the flow plates. In order to investigate the magnitudes of the pressure differences across the supports and the places where the maximum pressure differences occur, the flow and pressure variations in various forms of serpentine channels, these channels having a rectangular cross-sectional shape, have been numerically calculated. The presence of the diffusion layer has been ignored and the flow has been calculated using a commercial finite-element software package using the governing equations written in dimensionless form. Solutions have been obtained for various values of the Reynolds number for each of the flow geometries considered for two channel height-to-width ratios (one and three). Except for the flow in the vicinity of the bends in channels, the pressure has been found, as is to be expected, not to vary significantly across the channel cross section. The difference between the center point dimensionless pressure in a given channel with those at the same longitudinal position in the adjacent channels has been determined. The dependence of the highest dimensionless pressure difference between channels on the input parameters has been examined. 273pt